Renouf and Langer are two of the greatest ever to have worn the Broncos jersey.

Boyd is a veteran of the club, won a grand final with Brisbane in 2006 and is the current captain.

The classy fullback missed the 2017 finals and the World Cup through injury and has been working hard to get back to full fitness.

The Broncos struggled without the 30-year-old and Renouf believes Boyd is the key to Brisbane having a successful 2018 campaign.

"Darius guides the attack and organises the defence at the back with his chat and he is just such a stable influence and so important to the team," the former centre told NRL.com.

"In attack he chimes in and does his own thing or he throws that cut out ball for the winger and he does it so well, so he is virtually another playmaker out wide. As the captain the players look to him for inspiration, as we used to do with Alfie Langer.

"Darius sat out the World Cup to work hard on that injury and get himself fit and in the long term it is going to be a big benefit." 

A dodgy hamstring kept the Kangaroos and Queensland star out for the end of 2017.

Boyd is hoping to see the benefits of a full pre-season.

"I've enjoyed doing rehab and working on areas where I needed to improve on my own personal body," he said.

"When you are back with the normal group you are just getting kilometres in your legs but I've been able to concentrate on certain areas that are week and need some strength or flexibility.

"It is just the one hamstring that was a problem, but I've worked on both hamstrings and my calves…everything that can help that hamstring a bit more and be stronger all-round."